docs: def underToMixed(name):
      """
      >>> underToMixed('some_large_model_name_perhaps')
      'someLargeModelNamePerhaps'
  
      >>> underToMixed('exception_for_id')
      'exceptionForID'
      """
      if name.endswith('_id'):
          return underToMixed(name[:-3] + "ID")
      return _underToMixedRE.sub(lambda m: m.group(0)[1].upper(),
                                 name)